S IV emission-line ratios in the sun

Details S IV emission-line ratios in the sun S IV emission-line ratios in the sun

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...257..338d&link_type=abstract

Astrophysical Journal, Part 1, vol. 257, June 1, 1982, p. 338-344. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

60

Atomic Spectra, Emission Spectra, Solar Spectra, Sulfur, Electron Scattering, Electron Transitions, Line Spectra, Spectral Line Width, Transition Probabilities

Scientific paper

New atomic data are presented for transitions between the five lowest levels in S IV, taking into account the fine-structure rates between the individual J levels together with the electron impact mixing rates within the levels. The values are found to differ significantly from previously published values. Using the atomic data, ionic level populations are deduced for a range of electron temperatures and densities. The results are used to calculate theoretical line intensity ratios for S IV. Excellent agreement is found with intensity ratios for a variety of solar features observed with the NRL normal incidence spectrograph on Skylab.

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